android: update download progress notification (ProgressStyle / Live Update on API 36+)

src/frontends/android/app/src/main/AndroidManifest.xml

@@ -30,6 +30,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.POST_PROMOTED_NOTIFICATIONS"/>
     <!-- required to install downloaded updates of the app itself -->
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
     <!-- lets the app install its own updates in the background without the

src/frontends/android/app/src/main/java/org/strongswan/android/logic/updates/UpdateManager.kt

@@ -14,6 +14,7 @@
 
 package org.strongswan.android.logic.updates
 
+import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.PendingIntent
@@ -113,6 +114,7 @@ class UpdateManager private constructor(private val context: Context)
 		private const val READ_TIMEOUT_MS = 10_000
 		private const val UPDATES_CHANNEL = "org.strongswan.android.updates"
 		private const val UPDATES_NOTIFICATION_ID = 1001
+		private const val UPDATES_PROGRESS_NOTIFICATION_ID = 1002
 
 		private var mInstance: UpdateManager? = null
 
@@ -323,6 +325,73 @@ class UpdateManager private constructor(private val context: Context)
 		return Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && UpdateInstaller.canInstall(context)
 	}
 
+
+	private fun ensureUpdatesChannel(manager: NotificationManager)
+	{
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
+		{
+			manager.createNotificationChannel(
+				NotificationChannel(UPDATES_CHANNEL, context.getString(R.string.updates_channel_name),
+									NotificationManager.IMPORTANCE_DEFAULT))
+		}
+	}
+
+	/**
+	 * Shows the download progress. Android 16+ gets Notification.ProgressStyle, promoted
+	 * to a Live Update (POST_PROMOTED_NOTIFICATIONS is a normal permission, granted at
+	 * install, so there is no extra prompt); older versions get the classic progress bar.
+	 */
+	private fun postDownloadProgress(info: UpdateInfo, progress: Int)
+	{
+		val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager ?: return
+		ensureUpdatesChannel(manager)
+		val title = context.getString(R.string.update_downloading_title, info.versionName)
+		val intent = Intent(context, MainActivity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP)
+		val pending = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE)
+		val notification = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.BAKLAVA)
+		{
+			Notification.Builder(context, UPDATES_CHANNEL)
+				.setSmallIcon(R.drawable.ic_notification)
+				.setContentTitle(title)
+				.setContentText("$progress%")
+				.setShortCriticalText("$progress%")
+				.setStyle(Notification.ProgressStyle()
+					.setProgressSegments(listOf(Notification.ProgressStyle.Segment(100)))
+					.setProgress(progress))
+				.setRequestPromotedOngoing(true)
+				.setOngoing(true)
+				.setOnlyAlertOnce(true)
+				.setContentIntent(pending)
+				.build()
+		}
+		else
+		{
+			NotificationCompat.Builder(context, UPDATES_CHANNEL)
+				.setSmallIcon(R.drawable.ic_notification)
+				.setContentTitle(title)
+				.setContentText("$progress%")
+				.setProgress(100, progress, false)
+				.setOngoing(true)
+				.setOnlyAlertOnce(true)
+				.setContentIntent(pending)
+				.build()
+		}
+		try
+		{
+			manager.notify(UPDATES_PROGRESS_NOTIFICATION_ID, notification)
+		}
+		catch (e: SecurityException)
+		{	/* POST_NOTIFICATIONS denied - progress stays visible in the settings */
+			Log.w(TAG, "Cannot post the update progress notification", e)
+		}
+	}
+
+	private fun cancelDownloadProgress()
+	{
+		(context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager)
+			?.cancel(UPDATES_PROGRESS_NOTIFICATION_ID)
+	}
+
 	/** Posts a notification that the downloaded update is ready to install */
 	private fun notifyUpdateReady(info: UpdateInfo)
 	{
@@ -507,6 +576,7 @@ class UpdateManager private constructor(private val context: Context)
 							{
 								lastProgress = progress
 								mState.value = UpdateState.Downloading(info, progress)
+								postDownloadProgress(info, progress)
 							}
 						}
 					}
@@ -527,6 +597,7 @@ class UpdateManager private constructor(private val context: Context)
 		finally
 		{
 			conn.disconnect()
+			cancelDownloadProgress()
 		}
 	}
 

src/frontends/android/app/src/main/res/values-de/strings.xml

@@ -505,4 +505,5 @@
     <string name="widget_description">Schutzstatus und Verbinden mit einem Tipp</string>
 
     <string name="profile_detail_placeholder">Profil auswählen oder hinzufügen</string>
+    <string name="update_downloading_title">Update %1$s wird heruntergeladen</string>
 </resources>

src/frontends/android/app/src/main/res/values-ru/strings.xml

@@ -502,4 +502,5 @@
     <string name="widget_label">SHX VPN</string>
     <string name="widget_description">Статус защиты и подключение одним касанием</string>
     <string name="profile_detail_placeholder">Выберите или добавьте профиль</string>
+    <string name="update_downloading_title">Загрузка обновления %1$s</string>
 </resources>

src/frontends/android/app/src/main/res/values/strings.xml

@@ -507,4 +507,5 @@
     <string name="widget_label">SHX VPN</string>
     <string name="widget_description">Protection status and one-tap connect</string>
     <string name="profile_detail_placeholder">Select or add a profile</string>
+    <string name="update_downloading_title">Downloading update %1$s</string>
 </resources>